1.First we need to set up some NFS shares. In this case we will do this on the RAC1 node, but you can do the on a NAS or a third server if you have one available. On the RAC1 node create the following directories.

mkdir /shared_config

mkdir /shared_grid

mkdir /shared_home

mkdir /shared_data

Add the following lines to the "/etc/exports" file. 这个步骤控制着共享。只在主节点操作。

/shared_config *(rw,sync,no_wdelay,insecure_locks,no_root_squash)

/shared_grid *(rw,sync,no_wdelay,insecure_locks,no_root_squash)

/shared_home *(rw,sync,no_wdelay,insecure_locks,no_root_squash)

/shared_data *(rw,sync,no_wdelay,insecure_locks,no_root_squash)

2.Run the following command to export the NFS shares.

chkconfig nfs on

service nfs restart

On both RAC1 and RAC2 create the directories in which the Oracle software will be installed.

mkdir -p /software/app/11.2.0/grid

mkdir -p /software/app/oracle/product/11.2.0/db_1

mkdir -p /software/oradata

mkdir -p /software/shared_config

chown -R oracle:oinstall /software/app /software/app/oracle /software/oradata /software/shared_config

chmod -R 775 /software/app /software/app/oracle /software/oradata /software/shared_config

3.Add the following lines to the "/etc/fstab" file. #开机自动挂载

nas1:/shared_config /software/shared_config nfs rw,bg,hard,nointr,tcp,vers=3,timeo=600,rsize=32768,wsize=32768,actimeo=0 0 0

nas1:/shared_grid /software/app/11.2.0/grid nfs rw,bg,hard,nointr,tcp,vers=3,timeo=600,rsize=32768,wsize=32768,actimeo=0 0 0

nas1:/shared_home /software/app/oracle/product/11.2.0/db_1 nfs rw,bg,hard,nointr,tcp,vers=3,timeo=600,rsize=32768,wsize=32768,actimeo=0 0 0

nas1:/shared_data /software/oradata nfs rw,bg,hard,nointr,tcp,vers=3,timeo=600,rsize=32768,wsize=32768,actimeo=0 0 0

4.Mount the NFS shares on both servers.

mount /software/shared_config

mount /software/app/11.2.0/grid

mount /software/app/oracle/product/11.2.0/db_1

mount /software/oradata

5.Make sure the permissions on the shared directories are correct.

chown -R oracle:oinstall /software/shared_config

chown -R oracle:oinstall /software/app/11.2.0/grid

chown -R oracle:oinstall /software/app/oracle/product/11.2.0/db_1

chown -R oracle:oinstall /software/oradata

实际工作中的问题：RAC共享磁盘是利用的NFS

rac1: 192.168.3.21

rac2:192.168.3.26

[oracle@rac1 ~]$ df -h
文件系统              容量  已用可用已用% 挂载点
/dev/sda2             142G  107G   29G  79% /
/dev/sda6              66G   48G   16G  76% /data
/dev/sda3              48G   20G   25G  45% /software
/dev/sda1             190M   14M  167M   8% /boot
tmpfs                  16G  537M   16G   4% /dev/shm
/dev/mapper/mpath2    2.0T  2.0T  0G 100% /backup
/dev/mapper/oraclep1 1008G  661G  297G  70% /software/oradata01
rac1:/shared_grid     142G  107G   29G  79% /software/app/11.2.0/grid
rac1:/shared_home     142G  107G   29G  79% /software/app/oracle/product/11.2.0/db_1
rac1:/shared_config   142G  107G   29G  79% /software/shared_config
rac1:/shared_data     142G  107G   29G  79% /software/oradata
none                   16G  128K   16G   1% /var/lib/xenstored
/dev/mapper/mpath3    2.0T  1.2T  645G  66% /software/oradata02

现在是/backup 这个目录已经满了但是这个里面是要存逻辑备份的，

因为这个这个目录也是共享的，定时任务里的脚本路径好多都是写的/backup/expdp，所以要是不想一个一个去改脚本，最好的办法就是把一个新的文件系统挂在到/backup/expdp 这个目录下。下面是具体过程;

一：先把expdp重命名成expdp1 ，然后重新在/backup下建立expdp 目录。这步骤非常重要，因为如果你直接将一个新的文件系统挂在到/backup/expdp，就会导致原来/backup/expdp下面的内容就看不到了。

[oracle@rac1 backup]$ mv expdp expdp1

第二：把新加进的磁盘，创建成文件系统之后，

[oracle@rac1 backup]$ mount /dev/mapper/mpath4 /backup/expdp

第三：然后把/backup/expdp1下所有内容mv到/backup/expdp下，这样就能满足不用修改脚本，空间也是足够的，以为这时候你虽然还是在/backup/expdp这个目录里写东西，但是底层文件系统已经改变。

但是这个时候还要让他共享。

[oracle@rac1 backup]$ cat /etc/exports
#/software/oradata01    192.168.3.0/24(rw,sync,no_root_squash)
#/1TB   192.168.3.0/24(rw,sync,no_root_squash)
#/one   192.168.3.0/24(rw,sync,no_root_squash)
#/two   192.168.3.0/24(rw,sync,no_root_squash)
#/three 192.168.3.0/24(rw,sync,no_root_squash)
#/five  192.168.3.0/24(rw,sync,no_root_squash)
#/six   192.168.3.0/24(rw,sync,no_root_squash)
/shared_config               *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/shared_grid                 *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/shared_home                 *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/shared_data                 *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/software/oradata01          *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/software/oradata02          *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/backup 192.168.3.0/24(rw,sync,no_root_squash)

原来只是共享了/backup，

这时候你在 rac2只能看到有expdp这个目录，但是这下面没有任何内容。

[oracle@rac2 ~]$ df -h
文件系统              容量  已用可用已用% 挂载点
/dev/sda2              76G   16G   57G  22% /
/dev/sda6             132G   87G   39G  69% /data
/dev/sda3              48G   23G   22G  52% /software
/dev/sda1             190M   20M  161M  11% /boot
tmpfs                  16G     0   16G   0% /dev/shm
rac1:/shared_data     142G  107G   29G  79% /software/oradata
rac1:/shared_grid     142G  107G   29G  79% /software/app/11.2.0/grid
rac1:/software/oradata01
                     1008G  661G  297G  70% /software/oradata01
rac1:/shared_config   142G  107G   29G  79% /software/shared_config
rac1:/shared_home     142G  107G   29G  79% /software/app/oracle/product/11.2.0/db_1
none                   16G  128K   16G   1% /var/lib/xenstored
rac1:/software/oradata02
                      2.0T  1.2T  645G  66% /software/oradata02
192.168.3.21:/backup  2.0T  1.3T  666G  66% /backup

[oracle@rac2 backup]$ cd expdp/
[oracle@rac2 expdp]$ ll
总计 0

怎样才可能让rac2也能看到内容呢？如下所示：

1.首先在rac1操作：将/backup/expdp也添加到共享文件中。

[oracle@rac1 backup]$ vi /etc/exports
#/software/oradata01    192.168.3.0/24(rw,sync,no_root_squash)
#/1TB   192.168.3.0/24(rw,sync,no_root_squash)
#/one   192.168.3.0/24(rw,sync,no_root_squash)
#/two   192.168.3.0/24(rw,sync,no_root_squash)
#/three 192.168.3.0/24(rw,sync,no_root_squash)
#/five  192.168.3.0/24(rw,sync,no_root_squash)
#/six   192.168.3.0/24(rw,sync,no_root_squash)
/shared_config               *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/shared_grid                 *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/shared_home                 *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/shared_data                 *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/software/oradata01          *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/software/oradata02          *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/backup 192.168.3.0/24(rw,sync,no_root_squash)
/backup/expdp  192.168.3.0/24(rw,sync,no_root_squash)

2.重启nfs服务：

[oracle@rac1 backup]$ service nfs restart

3，在rac2操作，重新挂载/backup

[oracle@rac2 ~]$ umount 192.168.3.21:/backup /backup/

[oracle@rac2 ~]$mount 192.168.3.21:/backup /backup/

4，这时候就会发现能看到了。

[oracle@rac2 expdp]$ ll

-rw-r--r-- 1 oracle oinstall 2608 07-17 04:06 GLOBAL_DE_DE_150717-0405.log

-rw-r----- 1 oracle oinstall 471040 07-18 04:12 GLOBAL_DE_DE_150718-0411.dmp

-rw-r--r-- 1 oracle oinstall 2608 07-18 04:12 GLOBAL_DE_DE_150718-0411.log

-rw-r----- 1 oracle oinstall 471040 07-19 04:10 GLOBAL_DE_DE_150719-0409.dmp

-rw-r--r-- 1 oracle oinstall 2608 07-19 04:10 GLOBAL_DE_DE_150719-0409.log

-rw-r----- 1 oracle oinstall 471040 07-20 04:06 GLOBAL_DE_DE_150720-0404.dmp

-rw-r--r-- 1 oracle oinstall 2608 07-20 04:06 GLOBAL_DE_DE_150720-0404.log

-rw-r----- 1 oracle oinstall 471040 07-21 04:16 GLOBAL_DE_DE_150721-0415.dmp

-rw-r--r-- 1 oracle oinstall 2608 07-21 04:16 GLOBAL_DE_DE_150721-0415.log

-rw-r----- 1 oracle oinstall 471040 07-22 04:15 GLOBAL_DE_DE_150722-0413.dmp

-rw-r--r-- 1 oracle oinstall 2608 07-22 04:15 GLOBAL_DE_DE_150722-0413.log

-rw-r----- 1 oracle oinstall 471040 07-23 04:07 GLOBAL_DE_DE_150723-0405.dmp

-rw-r--r-- 1 oracle oinstall 2608 07-23 04:07 GLOBAL_DE_DE_150723-0405.log

-rw-r----- 1 oracle oinstall 471040 07-24 04:05 GLOBAL_DE_DE_150724-0404.dmp

-rw-r--r-- 1 oracle oinstall 2608 07-24 04:05 GLOBAL_DE_DE_150724-0404.log

-rw-r----- 1 oracle oinstall 471040 07-25 04:12 GLOBAL_DE_DE_150725-0411.dmp

-rw-r--r-- 1 oracle oinstall 2608 07-25 04:12 GLOBAL_DE_DE_150725-0411.log

最好再设置成开机自动挂载：

[oracle@rac2 ~]$ cat /etc/fstab
LABEL=/1                /                       ext3    defaults        1 1
LABEL=/data             /data                   ext3    defaults        1 2
LABEL=/software         /software               ext3    defaults        1 2
LABEL=/boot1            /boot                   ext3    defaults        1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
LABEL=SWAP-sda5         swap                    swap    defaults        0 0
# 192.168.3.21:/one     /one                    nfs     defaults        0 0
# 192.168.3.21:/1TB     /1TB                    nfs     defaults        0 0
# 192.168.3.21:/two     /two                    nfs     defaults        0 0
# 192.168.3.21:/three   /three                  nfs     defaults        0 0
# 192.168.3.21:/five    /five                   nfs     defaults        0 0
# 192.168.3.21:/six     /six                    nfs     defaults        0 0
rac1:/shared_config /software/shared_config  nfs  rw,bg,hard,nointr,tcp,vers=3,timeo=600,rsize=32768,wsize=32768,actimeo=0  0 0
rac1:/shared_grid   /software/app/11.2.0/grid  nfs  rw,bg,hard,nointr,tcp,vers=3,timeo=600,rsize=32768,wsize=32768,actimeo=0  0 0
rac1:/shared_home   /software/app/oracle/product/11.2.0/db_1  nfs  rw,bg,hard,nointr,tcp,vers=3,timeo=600,rsize=32768,wsize=32768,actimeo=0  0 0
rac1:/shared_data   /software/oradata  nfs  rw,bg,hard,nointr,tcp,vers=3,timeo=600,rsize=32768,wsize=32768,actimeo=0  0 0
rac1:/software/oradata01   /software/oradata01  nfs  rw,bg,hard,nointr,tcp,vers=3,timeo=600,rsize=32768,wsize=32768,actimeo=0  0 0
192.168.3.21:/backup    /backup                 nfs     defaults        0 0 #这就开机自动挂载了

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